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perf sched timehist: Add support for filtering on CPU

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Allow user to limit output to one or more CPUs. Really helpful on
systems with a large number of cpus.

Committer testing:

  # perf sched record -a sleep 1
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 1.765 MB perf.data (1412 samples) ]
  [root@quaco ~]# perf sched timehist | head
  Samples do not have callchains.
             time    cpu  task name                       wait time  sch delay   run time
                          [tid/pid]                          (msec)     (msec)     (msec)
  --------------- ------  ------------------------------  ---------  ---------  ---------
     66307.802686 [0000]  perf[13086]                         0.000      0.000      0.000
     66307.802700 [0000]  migration/0[12]                     0.000      0.001      0.014
     66307.802766 [0001]  perf[13086]                         0.000      0.000      0.000
     66307.802774 [0001]  migration/1[15]                     0.000      0.001      0.007
     66307.802841 [0002]  perf[13086]                         0.000      0.000      0.000
     66307.802849 [0002]  migration/2[20]                     0.000      0.001      0.008
     66307.802913 [0003]  perf[13086]                         0.000      0.000      0.000
  #
  # perf sched timehist --cpu 2 | head
  Samples do not have callchains.
             time    cpu  task name                       wait time  sch delay   run time
                          [tid/pid]                          (msec)     (msec)     (msec)
  --------------- ------  ------------------------------  ---------  ---------  ---------
     66307.802841 [0002]  perf[13086]                         0.000      0.000      0.000
     66307.802849 [0002]  migration/2[20]                     0.000      0.001      0.008
     66307.964485 [0002]  <idle>                              0.000      0.000    161.635
     66307.964811 [0002]  CPU 0/KVM[3589/3561]                0.000      0.056      0.325
     66307.965477 [0002]  <idle>                              0.325      0.000      0.666
     66307.965553 [0002]  CPU 0/KVM[3589/3561]                0.666      0.024      0.076
     66307.966456 [0002]  <idle>                              0.076      0.000      0.903
  #

Signed-off-by: David Ahern <dsahern@gmail.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lore.kernel.org/lkml/20191204173925.66976-1-dsahern@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
David Ahern 2019-12-04 10:39:25 -07:00 committed by Arnaldo Carvalho de Melo
parent 8384a2600c
commit c30d630d1b
2 changed files with 17 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

4
tools/perf/Documentation/perf-sched.txt
View file

@ -110,6 +110,10 @@ OPTIONS for 'perf sched timehist'
--max-stack::
Maximum number of functions to display in backtrace, default 5.
-C=::
--cpu=::
Only show events for the given CPU(s) (comma separated list).
-p=::
--pid=::
Only show events for given process ID (comma separated list).

13
tools/perf/builtin-sched.c
View file

@ -51,6 +51,9 @@
#define SYM_LEN 129
#define MAX_PID 1024000
static const char *cpu_list;
static DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
struct sched_atom;
struct task_desc {
@ -2008,6 +2011,9 @@ static void timehist_print_sample(struct perf_sched *sched,
char nstr[30];
u64 wait_time;
if (cpu_list && !test_bit(sample->cpu, cpu_bitmap))
return;
timestamp__scnprintf_usec(t, tstr, sizeof(tstr));
printf("%15s [%04d] ", tstr, sample->cpu);
@ -2994,6 +3000,12 @@ static int perf_sched__timehist(struct perf_sched *sched)
if (IS_ERR(session))
return PTR_ERR(session);
if (cpu_list) {
err = perf_session__cpu_bitmap(session, cpu_list, cpu_bitmap);
if (err < 0)
goto out;
}
evlist = session->evlist;
symbol__init(&session->header.env);
@ -3429,6 +3441,7 @@ int cmd_sched(int argc, const char **argv)
"analyze events only for given process id(s)"),
OPT_STRING('t', "tid", &symbol_conf.tid_list_str, "tid[,tid...]",
"analyze events only for given thread id(s)"),
OPT_STRING('C', "cpu", &cpu_list, "cpu", "list of cpus to profile"),
OPT_PARENT(sched_options)
};